diff --git a/include/mach-o/ChangeLog b/include/mach-o/ChangeLog
index 0280ca778..2cd71c963 100644
--- a/include/mach-o/ChangeLog
+++ b/include/mach-o/ChangeLog
@@ -1,3 +1,7 @@
+2012-01-04  Tristan Gingold  <gingold@adacore.com>
+
+	* external.h (mach_o_fvmlib_command_external): New structure.
+
 2012-01-04  Tristan Gingold  <gingold@adacore.com>
 
 	* loader.h: Update copyright year.
diff --git a/include/mach-o/external.h b/include/mach-o/external.h
index 23d9a5c00..ad419ef54 100644
--- a/include/mach-o/external.h
+++ b/include/mach-o/external.h
@@ -262,6 +262,13 @@ struct mach_o_encryption_info_command_external
   unsigned char cryptid[4];	/* Encryption method.  */
 };
 
+struct mach_o_fvmlib_command_external
+{
+  unsigned char name[4];	/* Offset of the name.  */
+  unsigned char minor_version[4];
+  unsigned char header_addr[4];
+};
+
 struct mach_o_fat_header_external
 {
   unsigned char magic[4];